CuZn39Pb3 Brass Parts – CuZn39Pb3 Components

CuZn39Pb3 Brass Parts and CuZn39Pb3 Components

CuZn39Pb3 brass parts — identified in procurement specifications as CuZn39Pb3 components, CuZn39Pb3 machined parts, CuZn39Pb3 turned components, CW614N parts (EN designation), CZ121 parts (BS designation), IS 319 Type 1 parts (Indian designation), or C36000 parts (ASTM designation) — are precision-machined metal components produced from the world’s most widely used free-cutting copper-zinc-lead alloy. CuZn39Pb3 denotes the nominal composition: approximately 39% zinc, 3% lead, and the balance copper (~58%). Electrical Accessories India manufactures CuZn39Pb3 components for electrical OEMs, instrumentation manufacturers, industrial distributors, and export buyers using CNC turning centres, automatic screw machines, and Swiss-type lathes in our Jamnagar, Gujarat facility.

Product Overview

Understanding CuZn39Pb3 Alloy Designation

CuZn39Pb3 is the compositional name for free-cutting brass following ISO/EN naming conventions: Cu = copper, Zn39 = 39% zinc, Pb3 = 3% lead. Different standards apply different designation systems to this same alloy: CW614N (EN 12164, European standard), CZ121 (BS 2874, British Standard), C36000 (ASTM B16, American standard), IS 319 Type 1 (BIS Indian standard), and CuZn39Pb3 DIN 17660 (German standard). Electrical Accessories India accepts specifications in any of these designations — they refer to the same alloy and we supply a single CW614N-certified material for all of them. This cross-standard compatibility is essential for global OEMs whose drawings may reference different national standards.

Why CuZn39Pb3 Dominates Free-Machining Applications

CuZn39Pb3 achieves machinability index 100 because lead (3%) forms fine globular inclusions that interrupt chip continuity during cutting, producing short, non-tangling chips that clear the cutting zone efficiently. This allows machining at 200–350 m/min cutting speed, high feed rates, and excellent surface finish (Ra 0.8 µm achievable without secondary operations). Compared to other brass grades, CuZn39Pb3 requires 40–50% less machining time than CuZn30 (cartridge brass) and approximately the same time as leaded free-cutting aluminium — at much lower material cost per density-for-density comparison in most applications. The alloy offers an optimal balance of machinability, corrosion resistance, strength, and cost.

Physical and Mechanical Properties

CuZn39Pb3 brass has: density 8.5 g/cm³, copper content 57–59%, zinc ~39%, lead 2.5–3.5%. Electrical conductivity ~26–28% IACS (International Annealed Copper Standard) — adequate for terminal and connector applications but not for high-current bus applications. Thermal conductivity ~120 W/m·K. Tensile strength 380–490 MPa depending on temper (R360–R490 per EN 12164). Yield strength 200–340 MPa. Elongation 5–15%. Modulus of elasticity ~100 GPa. Melting range approximately 885–900°C. CuZn39Pb3 does not precipitation-harden and cannot be heat-treated for strength increase — the as-drawn hardness and temper are set during the rod manufacturing process.

CuZn39Pb3 Component Manufacturing at Electrical Accessories India

Electrical Accessories India operates dedicated CuZn39Pb3 machining cells for high-volume electrical component production. CNC turning centres handle prototype to medium-volume orders with complex geometry. Multi-spindle automatics produce terminal pins, connector bodies, and fasteners at rates of 100–300 pieces/minute. Swiss-type lathes handle slender, long-length parts with L/D ratios up to 20:1. All machines are equipped with automatic barfeed systems for unattended production and are connected to our SPC quality monitoring system for real-time dimensional tracking. Tool life monitoring prevents out-of-tolerance production from worn tooling.

CuZn39Pb3 Parts for Electrical Applications

The electrical industry is the largest consumer of CuZn39Pb3 machined parts. Key applications: cable gland bodies and locknuts (M16–M63 metric, NPT 1/2″–2″) for low-voltage and medium-voltage cable management; terminal pins and contact pins in industrial connectors (M2.5–M12); earth terminal studs and star washers in switchgear panels; busbar connectors and insert fittings for power distribution; panel board fittings including brass standoffs, PCB pillars, and earthing screws; transformer connector fittings; conduit locknuts and adaptors for industrial cable conduit systems. All these components exploit CuZn39Pb3’s combination of electrical conductivity, machinability, and corrosion resistance.

Corrosion Behaviour and Limitations of CuZn39Pb3

CuZn39Pb3 performs well in: dry indoor atmospheres, fresh water (not potable contact), mineral oils, many organic solvents, and mild aqueous environments. Dezincification risk exists in: stagnant hot water, highly oxygenated salt water, soil, and acidic solutions. In these environments, zinc selectively leaches from the brass matrix, leaving a porous copper-rich layer of reduced strength. For dezincification-risk applications, CW602N (CuZn36Pb2As) DZR brass is the correct alternative. CuZn39Pb3 is also susceptible to stress corrosion cracking (season cracking) in ammonia-bearing environments — parts must be stress-relieved (low-temperature annealing at 150–250°C) before use in such conditions.

Key Features

• CuZn39Pb3 = CW614N = CZ121 = C36000 = IS 319 Type 1 — all designations accepted
• Machinability index 100 — globally recognised reference standard for machinability
• Tensile strength 380–490 MPa; conductivity ~27% IACS
• ISO 9001:2015 certified; EN 10204 3.1 MTRs with every batch
• Component range: M3–M64 threads; 2–150 mm OD; up to 500 mm length
• Tolerances ±0.01 mm precision; 6g/6H threads; Ra 0.8–3.2 µm
• Plating: nickel, tin, chrome, electroless nickel, passivation
• High-volume production up to 10 million pieces/year on multi-spindle automatics
• Stress-relief annealing available for ammonia-environment service
• RoHS Annex II 6(c) and REACH compliance declarations

Material Grades and International Equivalents

Technical Specifications

Product Types and Variants

CuZn39Pb3 components from Electrical Accessories India: Cable gland bodies (metric M16–M63, NPT, PG thread); Terminal and contact pins for electrical connectors; Threaded inserts and hex nuts for moulded and structural assemblies; Brass studs and bolts for electrical and mechanical applications; Connector body shells for industrial multipin connectors; Instrumentation fitting bodies — compression, push-to-connect, and flareless types; Valve components — stems, seats, and bodies for industrial valves; Custom CuZn39Pb3 turned parts to customer drawing in any quantity.

Applications in Industry

CuZn39Pb3 parts are used throughout: Electrical industry — cable management, terminals, connectors, and panel hardware; Plumbing and HVAC — compression fittings, valve bodies, and manifolds; Automotive — fuel and pneumatic fittings, sensor housings; Instrumentation — fitting bodies, adapters, and flow meter components; Defence and marine — non-magnetic hardware and low-corrosion fittings in non-dezincification-risk environments; Telecommunications — RF connector bodies and coaxial accessories; Consumer products — architectural and decorative fittings, door hardware, and sanitary ware components.

Manufacturing Process

1. Alloy Verification: Incoming CuZn39Pb3 bar verified by XRF spectrometer; composition confirmed against MTR.
2. Programming/Setup: CNC program or cam setup per drawing; DFM check completed.
3. First Article: Trial piece produced; all dimensions checked; FAI report issued.
4. High-Volume Production: Barfeed automatic production; SPC monitoring of critical dimensions.
5. Secondary Ops: Tapping, drilling, milling, knurling as required by drawing.
6. Deburring: Edge removal by vibratory or hand method; visual inspection.
7. Stress Relief (if required): Low-temperature anneal at 150–250°C for 1 hour to relieve machining stresses.
8. Surface Finishing: Plating, polishing, or passivation per specification.
9. Final Inspection: AQL sampling; CMM measurement; thread gauging.
10. Pack and Ship: Export packing; full documentation; dispatch via air or sea freight.

Quality Standards and Certifications

CuZn39Pb3 components per: ISO 9001:2015; EN 12164 CW614N; ASTM B16 C36000; IS 319 Type 1; BS 2874 CZ121; DIN 17660 CuZn39Pb3; ISO 965 (thread tolerances); ISO 286 (fits and tolerances); RoHS 2011/65/EU Annex II 6(c) exemption; REACH SVHC declarations; EN 10204 3.1 or 2.2 MTRs on request.

Why Choose Electrical Accessories India

CuZn39Pb3 is our primary production material — over 60% of our machined component output is from this alloy family. Our expertise encompasses the complete range of CuZn39Pb3 forms: turned, forged, cast, stamped, and extruded. We have established tooling libraries for common CuZn39Pb3 component types, reducing setup costs and lead times for standard parts. Our cross-standard documentation capability (EN/BS/ASTM/IS) serves global OEM customers whose drawings use any national standard. Competitive pricing from the world’s lowest-cost brass machining location — Jamnagar — combined with ISO 9001 quality assurance and 30+ years of export experience makes Electrical Accessories India the preferred source for CuZn39Pb3 components.

Frequently Asked Questions (FAQ)

What does CuZn39Pb3 mean?

CuZn39Pb3 is the compositional designation following ISO/EN naming convention: Cu = copper (base metal), Zn39 = 39% zinc content, Pb3 = 3% lead content. The actual analysis ranges are Cu 57–59%, Zn balance (~38–40%), Pb 2.5–3.5%, with trace amounts of other elements within EN 12164 limits.

Is CuZn39Pb3 the same as brass?

Yes. Brass is any copper-zinc alloy. CuZn39Pb3 is a specific type of brass — free-cutting brass — which is the most widely produced and used brass alloy globally, characterised by its high zinc content (~39%) and lead addition for machinability. It is the “standard” brass of the machining industry.

Can CuZn39Pb3 be used in drinking water systems in Europe?

This depends on the specific EU member state’s drinking water regulation implementation. Under the EU Drinking Water Directive and national transpositions (e.g., KTW in Germany, WRAS in the UK), leaded brass (CuZn39Pb3 with ~3% Pb) may not be approved for prolonged potable water contact. CW602N (DZR brass, low-lead) is the compliant grade for potable water fittings in most EU markets. For non-potable industrial water, CuZn39Pb3 is generally acceptable.

What thread types are produced in CuZn39Pb3 parts?

Electrical Accessories India produces Metric (M3–M64), BSP (G1/8″–G4″), BSPT (R1/8″–R4″), NPT (1/16″–4″), NPTF, UN (UNC, UNF), and BA threads in CuZn39Pb3. All threads are gauged (Go/No-Go) 100% before dispatch.

What is the RoHS status of CuZn39Pb3?

CuZn39Pb3 contains lead above the 0.1% RoHS threshold, but is covered by Annex II Exemption 6(c): “Lead as an alloying element in brass used for fittings, components, and parts of plumbing and electrical installations.” This exemption has been renewed and is valid for most electrical and plumbing applications. Electrical Accessories India provides RoHS Annex II 6(c) declarations with every shipment.

What is your minimum order for CuZn39Pb3 components?

Minimum order: 1,000 pieces for standard turned components. For complex multi-step parts: 500 pieces. Prototype/sample quantities: 10–50 pieces. Annual blanket orders with call-off schedules available from 10,000 pieces/year.

Can you cross-certify to both EN and ASTM standards?

Yes. For customers whose specifications require ASTM B16 C36000 material certified to EN 12164 CW614N as well (or vice versa), Electrical Accessories India can issue documentation referencing both standards. We source CW614N rod that meets both EN and ASTM chemistry requirements, and can cross-certify on request.

What is your production capacity for CuZn39Pb3 turned parts?

Electrical Accessories India has capacity to produce 5–10 million CuZn39Pb3 turned components per month across our CNC and automatic screw machine platforms. For high-volume annual contracts (>1 million pieces/year), dedicated machine time allocation is available to guarantee delivery schedule compliance.

Equivalent Terms – Multilingual Reference

Related Products and Linked Terms

• Brass Parts – Brass CNC Machined Parts
• CZ121 Brass Turned Parts
• CW614N Brass Components and Parts
• Brass Turned Parts – Brass Turned Components
• Brass Screw Machine Parts
• Brass Hot Forged Parts – Brass Hot Stamped Parts

Request a Quote

Supply your drawing, sample, or specification and receive a detailed technical and commercial proposal within 24 hours. Electrical Accessories India engineers are available to advise on CuZn39Pb3 alloy suitability, machining, surface treatment, plating, and quality documentation for your specific requirements. We export to 30+ countries with full shipping documentation.

Contact us: Send your RFQ with quantity, grade (CuZn39Pb3 / CW614N / CZ121 / C36000 / IS 319), drawing, and delivery requirement. We respond within 24 business hours.